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LTE: Is it possible to switch from unicast bearer service to MBMS bearer service in LTE broadcast system ?

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What signalling messages get exchanged while switching from unicast mode to broadcast mode to receive the same MBMS service ?

posted Oct 29, 2016 by Rupam

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1 Answer

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Yes, it is possible UE can switch from unicast bearer service to MBMS bearer service when UE enters into the MBSFN area which is providing the same MBMS service it was getting through the dedicated unicast bearer. UE exchanges the messages with AS (application server) though GC1 interface. After getting the indication from the UE, application server (AS) stops sending the MBMS data through UE associated unicast bearer and it asks PCRF to delete the unicast bearer.

Before sending the indication to the AS, UE starts receiving data from the MTCH hence there is no interrupt in the receiving MBMS service.

answer Nov 1, 2016 by Harshita
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LTE: Is it possible during MBMS data transmission few of the eNodeBs have less MBMS resources compare to others ?

One question came out and want to get answer for that just to avoid assumptions what I have.
A multiple MBMS services are being transmitted over the air through eNodeBs belong to one MBSFN Area. Here I considered all the eNodeBs belongs to that particular MBSFN area have maximum six sub frames of a radio frame to broadcast the content and all eNodeBs are doing.
In between some of the eNodeBs belong to same MBSFN Area get congested and out of 6 sub frames only two subframes are being used in those eNodeB.
My first question where exactly things will be affected ?
Another question, MBMS-GW will be sending data in same speed with same SYNC information. Since few eNodeBs are congested then how data will be transmitted ? Segmentation at eNodeB RLC may affect User experience since UE combines the data in MBMS case from all the neighboring eNodeBs and get better result in term of quality.
If one eNodeB is sending data without segmentation and the other one is sending with segmentation then How UE RLC will behave and what will be the user experience ?

Please ignore these question if segmentation and reassembling is not applicable for MBMS data transmission at RLC.

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